<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>localStorage</title>
  </head>

  <body>
    <h2>localStorage</h2>
    <button onclick="saveData()">点我保存一个数据</button>
    <button onclick="readData()">点我读取一个数据</button>
    <button onclick="deleteData()">点我删除一个数据</button>
    <button onclick="deleteAllData()">点我清空数据</button>

    <script type="text/javascript">
      let p = { name: '张三', age: 18 }
      // console.log(p.toString())

      function saveData() {
        localStorage.setItem('data', 'hello world')
        localStorage.setItem('data2', 666)
        localStorage.setItem('person', JSON.stringify(p))
      }
      function readData() {
        console.log(localStorage.getItem('data'))
        console.log(localStorage.getItem('data2'))
        const result = localStorage.getItem('person')
        console.log(JSON.parse(result))
      }
      function deleteData() {
        localStorage.removeItem('data')
        localStorage.removeItem('data2')
        localStorage.removeItem('person')
        console.log('数据已删除')
      }
      function deleteAllData() {
        localStorage.clear()
      }
    </script>
  </body>
</html>
